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<h2><span class="refentrytitle">Struct template is_subconcept</span></h2>
<p>boost::type_erasure::is_subconcept</p>
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<h2 class="refsynopsisdiv-title">Synopsis</h2>
<div class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../boost_typeerasure/reference.html#doxygen.is__subconcept_8hpp" title="Header &lt;boost/type_erasure/is_subconcept.hpp&gt;">boost/type_erasure/is_subconcept.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Sub<span class="special">,</span> <span class="keyword">typename</span> Super<span class="special">,</span> <span class="keyword">typename</span> PlaceholderMap <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="structboost_1_1type__erasure_1_1is__subconcept.html" title="Struct template is_subconcept">is_subconcept</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">and_</span><span class="special">::</span><span class="identifier">type</span> <span class="special">{</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.39.13.22.3.4"></a><h2>Description</h2>
<p><a class="link" href="structboost_1_1type__erasure_1_1is__subconcept.html" title="Struct template is_subconcept">is_subconcept</a> is a boolean metafunction that determines whether one concept is a sub-concept of another.</p>
<pre class="programlisting"><span class="identifier">is_subconcept</span><span class="special">&lt;</span><span class="identifier">incrementable</span><span class="special">&lt;</span><span class="special">&gt;</span><span class="special">,</span> <span class="identifier">incrementable</span><span class="special">&lt;</span><span class="special">&gt;</span> <span class="special">&gt;</span>             <span class="special">-&gt;</span> <span class="keyword">true</span>
<span class="identifier">is_subconcept</span><span class="special">&lt;</span><span class="identifier">incrementable</span><span class="special">&lt;</span><span class="special">&gt;</span><span class="special">,</span> <span class="identifier">addable</span><span class="special">&lt;</span><span class="special">&gt;</span> <span class="special">&gt;</span>                   <span class="special">-&gt;</span> <span class="keyword">false</span>
<span class="identifier">is_subconcept</span><span class="special">&lt;</span><span class="identifier">incrementable</span><span class="special">&lt;</span><span class="identifier">_a</span><span class="special">&gt;</span><span class="special">,</span> <span class="identifier">forward_iterator</span><span class="special">&lt;</span><span class="identifier">_iter</span><span class="special">&gt;</span><span class="special">,</span>
  <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">map</span><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">_a</span><span class="special">,</span> <span class="identifier">_iter</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="special">&gt;</span>                          <span class="special">-&gt;</span> <span class="keyword">true</span>
</pre>
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<a name="id-1.3.39.13.22.3.4.5"></a><h3>Template Parameters</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">typename</span> Sub</pre>
<p>The sub concept </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">typename</span> Super</pre>
<p>The super concept </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">typename</span> PlaceholderMap <span class="special">=</span> <span class="keyword">void</span></pre>
<p>(optional) An MPL map with keys for every non-deduced placeholder in Sub. The associated value of each key is the corresponding placeholder in Super. If <code class="computeroutput">PlaceholderMap</code> is omitted, <code class="computeroutput">Super</code> and <code class="computeroutput">Sub</code> are presumed to use the same set of placeholders. </p>
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        Distributed under the Boost Software License, Version 1.0. (See accompanying
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